1. Department of Forest Microbiology, Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan
2. Miyagi Prefectural Forestry Technology Institute, Ohira, Miyagi 981-3602, Japan
3. Nara Forest Research Institute, Takatori, Nara 635-0133, Japan
4. Shiga Forest Research Center, Yasu, Shiga 520-2321, Japan
5. Department of Applied Microbiology and Mushroom Science, Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan
6. University of the Ryukyus, Taketomi, Okinawa 907-1541, Japan
7. Shinshu University, 8304 Minami-minowa, Nagano 399-4598, Japan